Runner blade for steam turbines



July 24,1928.

G. MENz RUNNER BLADE *FOR STEAM TURBINES Fiied Feb. 12, 1927 Patented July 24, 192s.

UNITED kysriij'rns\ GUSTAV MENZ,v OF BERLIN-CHARLOTTENBURG, GERMANY, .ASSIGNOR T0 SIEMENS# SCHUCKERTWERKE GESELLSCHAFT MIT BESCHRNKTER HAFTUNG, OF BERLIN`- SIEMENSSTADT, GERMANY, A CORPORATION OF GERMANY. i 5

BIUNNR `IBLADE FOR STEAM TU'RBINES.

Application medrebruar'y 12,1927, semi No. 1671er.anain'eermany reybniadry 1K7, 1926.y

My invention relates to the runner blades for steam turbines.

It is well known to machine the blades of runners or rotor wheels of steam turbines out of a solid ring placed upon and bolted to the body of the runner. The covering band is also constructed as a solid ring and fitted upon the blade ring.-

In the hitherto employed constructions `forces set up by heat stresses are liable to be transferred from the runner to the blade ring and vice versa, owing to the solid joint- ,ing of the two parts.` As this is apt to lead to distortions of the part-s the operation of the turbine might become endangered thereb The object of my invention is to eliminate this drawback. My invention consists in mounting the blade carrier ring upon the runner wheel by means of one or a plurality of rings itted into recesses and against the runner and the blade carrier in axial direction. In this way the runner and the blade carrier are able to sustain the stresses prevailing in them without one part aii'ecting the other.

In the drawing affixed hereto an embodiment of my invention is shown by way ot' example represented in y Fig. l, a cross-section through art of a turbine containing two of my improved runner wheels, on one of them being shown the covering band and on the other the manner of ixing the blade ring,

Fig. 2, a sectional plan of Fig. l, and

Fig. 3, a longitudinal section through part of a runner wheel.

Like parts are indicated by like numerals in all the figures of the drawing.

Referring to Fig. 1, it will be observed that the runner wheel l is provided upon its circumference with a central outer peripheral projection orliange 8 the diameter of which corresponds with the inner diameter of the blade ring 2. This blade ring is likewise provided with an inner peripheral projection or flange 9 of vthe same diameter as the flange 8. To prevent an axial displacement of the blade ring upon the runner, rings 4 and 5 are placed at both sides into the recesses of the runner wheel and the blade ring and against the flanges 8 and 9 and forced against the flanges by screws or rivets 7. A lateral displacement of the blade ring upon the runner wheel is thus effectively prevented. It will be understood that it is not absolutely necessary that locking rings 4- and 5 should be provided at both sides of the iianges, but the flange 9 upon the blade ring 2. might at one side project beyond the flange 8 of the runner so that only one locking ring would then be necessary. Y

As shown on the left-hand runner wheel in Fig. l and in plan in Fig. 3, the covering band 3 is fixed to the blade ring 2 by radial bolts 6 so as to prevent relative motion. The bolts 6 must not be subjected to tangential stresses as otherwise they might be shorn oli?.

To prevent the blade ring 2 mounted upon the runner wheel as specified above trom creeping upon the wheel, radial keys or wedges l0, Fig. 3, are inserted between the two parts which prevent a relative displacement in a circumferential direction.

Various modifications and changes maybe made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention 1. In a rotor for steam turbines, the combination of a runner, a blade ring mounted on the periphery of said runner., krunner blades integral with said blade ring, at least one retaining ring for said blade ring, there being an annular recess extending over a portion of the blade ring and ofthe runner for receiving said retaining ring, and means for pressing saidY ring against the blade ring and the runner to hold the former in place, whereby the transmission of stresses between the runner and the bladering is prevented.

2. In a rotor for steam turbines, the combination oa runner, a blade ring mounted on the periphery of said runner, runner blades integral with said blade ring, a retaining ring on each side of the blade ring for said blade ring, there being an annular recess on each side of the runner, eXtending over a portion of the blade ring and of the runner for receiving said retaining rings, and bolts holding said retaining rings together, whereby the blade ring is secured PATENT orifice.:

to the runner in axial direction and Where-` on the periphery of said runner, runner,v

blades integral with said blade ringar e taining ring on each side of the blade ring for said blade ring, there beingv an annular recess on each side of the runner, extending over aportion of the blade'ring-and of e; l 1,678,263 i the runner for receiving said retaining rings, and bolts holding saidiretaining rings together',v Wherebythe blade ring is secured to the yrunner in axial direction and Where- -by the transmission of stressesbetween the runner` and the .blade ring is prevented,and transversekeys engaging said blade ring and said runner forsecuring the blade ring to the runner in circumferential direction.

GUSTAV MEN Z.

In vtestimony whereof I atlix my signature; 

